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OpenStudy (anonymous):
Rewrite the equation in a rotated x'y'-system without an x'y' term. Express the equation involving x' and y' in the standard form of a conic section. 31x^2 + 10 square root 3xy + 21y^2 -144 = 0
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OpenStudy (anonymous):
i got it this answer is x'2/4 + y'2/9 = 1
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